Chris,The Ultimate and Ultramax are quiet. Of the two, the Ultimate is quieter. No problem, I'm sure your kids will sleep well. Terry

: I know that this question has probably been answered before, but how does the flushing noise of the Toto: Ultramax or Ultimate compare with a Kohler Wellworth Lite? I have small children and I am concerned that : the noise of the toilet will wake them up at night, since the bathroom is right next to their bedrooms